code: def memcpy(source: np.ndarray, dest: np.ndarray):
      return ctypes_memcopy(
          source.ctypes.data,
          dest.ctypes.data,
          source.size * source.itemsize,
      )
  
file_path: ffcv/ffcv/libffcv.py
imports: import ctypes
  from numba import njit
  import numpy
  import platform
  from ctypes import CDLL, c_int64, c_uint8, c_uint64, POINTER, c_void_p, c_uint32, c_bool, cdll
  import ffcv._libffcv
label_desc: Use image node_id 4 for calling a global function with example usage: memcpy(source, dest) and returns: ctypes_memcopy